Complete home: perhaps dab on the outside (6)
I believe the answer is:
finish
'complete' is the definition.
('finish' can be a synonym of 'complete')
'home perhaps dab on the outside' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'perhaps dab' becomes 'fish' (dab is a type of fish).
'on the outside' means one lot of letters goes inside another.
'in' put into 'fish' is 'FINISH'.
(Other definitions for finish that I've seen before include "completion" , "'End, close (6)'" , "Conclude, end" , "Bring to an end" , "Patina" .)